So for this you need to buy a digital copy of the standard edition of the game (link is to Microsoft Store and using their price as example)
After this, go to the Xbox Store and look for the "Cross Gen Bundle". The price will be marked down from £65 to £5
This is the cost that standard edition owners pay to upgrade to cross gen bundle, but as you can gift two copies of any Microsoft/Xbox Store item to friends. If you gift this the recipient will receive the full game, not just an upgrade.
Meaning that for the cost of the original standard game (£60 direct from MS/Xbox Store) plus 2 x £5 upgrade charges, you can get 3 copies of the full game
Meaning for £70 total you can have three copies of the game, split between the recipients and yourself that's £23.33 per copy.
I have done this myself yesterday with 2 friends and they have confirmed full game has downloaded.
Happy to answer any questions on the process!